I have the earthquake SWS's installed in my roadster, had modify the baskets a little to get them to fit, but am very happy with the results. I went with a precision power phantom amp under the passenger seat, also rated at 100w x 4 into 4 ohms, and JBL GTO components in the front and was also able to clip them into the factory tweeter location. It was a major difference in sound quality and volume, with a fairly modest price tag.